The origin of my essay is Barack Obama's victory speech in 2008. The essay is an attempt to illustrate the correlation between speech and politics in various aspects and prospects. I hope the reader can enhance the skills of persuasive power in speech. Because in political opinions nothing is random. We can use the power of persuasion to make sure things are moving in the right direction of your plan. I have found that there are several persuasive appeals in the victory speech. Language is powerful. After all, politics is based on the power of influence. If politicians master persuasive strategies well, the public can act and believe in the politician's moral, political and cultural values. Speech is one of the most effective means that can alter the thinking and behavior of the audience. “Politics is one of the social fields whose practices are practically exclusively discursive” (Discourse and Politics, 2009). Discourse construction plays a vital role in politics. In his 2008 victory speech, Obama used paragraph structure, vocabulary, and tones with formal form to grab listeners' attention. The victory speech is different from our daily dialogue, which has a clear and accurate message about changing the state. To improve the efficiency of message transmission, he used a narrow structure and sophisticated vocabulary. There are mainly three positions in the political field. They are the dominant hegemonic positions, the negotiated positions and the oppositional positions. Let's take Hong Kong's Article 23 as an example. The left wings supported him; therefore, they held the dominant hegemonic positions. The right are the opposition positions. However, there are some people who seem apathetic about it. They are the negotiation… the middle of the paper… in the dust bowl and depression across the country, he saw a nation conquer fear itself with a New Deal, new jobs and a new sense of common purpose. Yes, we can." (Transcription: 'This is your victory,' says Obama, 2008) “New deal, new jobs and new meaning” were the positive and energetic words, implying a bright future. The triple was a method to create emphasis. The use of “New” echoed the theme of change and brought the belief of being reborn. The speaker made a prudent lexical selection to reinforce the ideology. Furthermore, alliteration was also a persuasive strategy. used to reinforce the ideas and the main theme. His characteristic was to repeat the identical first letter, in this case they were despair, dust and depression. He could choose “gloomy” or “lowered” to express, however, he chose “despair”. “dust” and “depression” to create alliteration.